[Someone]

"There's nothing that would prevent a good storage system + wind + power from supplying 100% of the power requirements reliably. You just need to scale your Storage system to handle the periods in which solar/wind aren't driving power."

Nothing, except for costs. Those are going down and are becoming competitive for many parts of the world, but costs will be prohibitive for some climates for quite a while. For example, if you have lots of snow and strong winds in winter, you may need to have _weeks_ of power storage to get reliable power.

Keeping a grid connection for those cases will help, but if lots of people do this, the price of power in those peak periods may surge a lot as your electricity supplier will have to recoup the costs of keeping its plant on standby year round in a few weeks.

That seems fixable by connecting solar/wind systems over large distances, but we have to work on getting a grid that is fed by thousands of suppliers and in which the direction power flows can vary more.

But yes, I think solar and wind are the future and even the near future, even in the less sunny parts of the world.